Revert "irqchip/armada-370-xp: Fix regression by clearing IRQ_NOAUTOEN"

This reverts commit 353d6d6c, which is
no longer needed, now that the irq-armada-370-xp driver properly
re-enables per-CPU interrupt on both the boot CPU and secondary CPUs
after resume.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>